cant passing 'QList<QSqlRecord>&'

[rifky]

Hi,
I found the error at my debug log

QObject::connect: Cannot queue arguments of type 'QList<QSqlRecord>&'
(Make sure 'QList<QSqlRecord>&' is registered using qRegisterMetaType().)

how can i pass the QList<QSqlRecord>& with signal slot ?

[JonB]

@rifky
You cannot have QList<QObject-type>, QObjects are not copyable. I'm guessing you might mean QList<QSqlRecord &> or QList<QSqlRecord *>?

Furthermore, the fact that you only find this in some runtime log rather than at compile-time indicates to me that you are using the old-style SIGNAL/SLOT() macros. You would get this right at compile-time if you changed over to https://wiki.qt.io/New_Signal_Slot_Syntax, which is highly recommended.

[SGaist]

Hi,

@rifky The error message already tels you what to do, however using a reference in a signal is pretty unusual. When passing containers around, it's more common to use const references to avoid unnecessary duplication.

@JonB QSqlRecord is not QObject based. It can be copied without problem.

[JonB]

@SGaist said in cant passing 'QList<QSqlRecord>&':

@JonB QSqlRecord is not QObject based

Well it ought to be ;-) Yeah, OK, I didn't check!

[rifky]

@SGaist

is it like this ?

void executeOneTime2(const QString &queryId, const QString &sql,const QList<QSqlRecord> recs, int &last_insert_id, bool &returnUD);

[Christian Ehrlicher]

@rifky said in cant passing 'QList<QSqlRecord>&':

how can i pass the QList<QSqlRecord>& with signal slot ?

The error messsage tells you exactly what you have to do: Make sure 'QList<QSqlRecord>&' is registered using qRegisterMetaType()

[jsulm]

@rifky said in cant passing 'QList<QSqlRecord>&':

const QList<QSqlRecord> recs

Const reference is

const QList<QSqlRecord> &recs